Feasibility analysis of Earth-Air Heat Exchanger (EAHE) in a sports and culture center in Tianjin, China

Cao, Shukun; Li, Fan; Li, Xin; Yang, Bing

doi:10.1016/j.csite.2021.101054

Cited by 11 publications

(5 citation statements)

References 14 publications

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“…The air entering in vertical EAHE at temperature of 257.30 K was found to be, respectively 279.82 K and 267.97 K at pipe outlet for 5⋅10 3 When tab. 8 is examined, it is seen that as the value of Reynolds number increases, the average air temperature values through vertical EAHE length decrease like in horizontal EAHE and there is a temperature difference of 11.85 K between the average air temperature values obtained for the highest and lowest values of Reynolds number at pipe outlet.…”

Section: Heating Performance Of Vertical Eahementioning

confidence: 95%

“…Despite these results, the average air temperature increases at horizontal EAHE for 4⋅10 4 , 6⋅10 4 , 8⋅10 4 , and 10 5 values of Reynolds number were higher than the average air temperature increases at vertical EAHE outlet. Earth, pipe and air-related temperature contours in vertical EAHE system for 5⋅10 3…”

Section: Heating Performance Of Vertical Eahementioning

confidence: 99%

“…For example, Kaushal [2] investigated the effect of parameters such as pipe material, earth thermal conductivity and air velocity on the thermal performance of EAHE. Cao et al [3] examined the applicability of EAHE in a building through theoretical calculation and numerical simulation. Soares et al [4] presented systematic information regard-THERMAL SCIENCE: Year 2022, Vol.…”

Section: Introductionmentioning

confidence: 99%

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A numerical study on heating performance of horizontal and vertical earth-air heat exchangers with equal pipe lengths

Taşdelen

Dagtekin

2022

THERM SCI

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In this study, heating performances of horizontal and vertical earth-air heat exchangers with equal pipe lengths were evaluated in ANSYS FLUENT 19.2 simulation program based on CFD for the winter period of Bitlis, Turkey. Thermal per?formance analyses regarding vertical and horizontal 3-D-modeled earth-air heat exchangers were evaluated in steady-state condition of the simulation program for different values of Re = 5?103, 104, 2?104, 4?104, 6?104, 8?104, and 105 numbers by using standard k-? turbulence model. Numerical results obtained from CFD based simulation program were compared with a numerical study in the literature, and it was determined that there was a consistency between the results. The pressure loss and fan power values of horizontal and vertical earth-air heat exchangers were also investigated in addition their thermal performances. A good agreement was found between the pressure loss values obtained from the theoretical and simulation calculations of both earth-air heat exchangers. Considering the temperature increases in both earth-air heat exchangers, the highest and lowest temperature increases were observed in vertical earth-air heat exchanger with 22.52 K and 10.67 K, respectively. The best thermal performance was observed in vertical earth-air heat exchanger for 5?103, 104, and 2?104 values of Reynolds number and in horizontal earth-air heat exchanger for 4?104, 6?104, 8?104, and 105 values of Reynolds number.

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Section: Heating Performance Of Vertical Eahementioning

confidence: 95%

Section: Heating Performance Of Vertical Eahementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A numerical study on heating performance of horizontal and vertical earth-air heat exchangers with equal pipe lengths

Taşdelen

Dagtekin

2022

THERM SCI

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“…D'Agostino et al [10] revealed that two thermal performance factors for EAHE resulting in good heat transfer: firstly, smaller diameters of the tubes, and secondly a length between 80 and 100 m. Al-Helal et al [11] showed that the EAHE exchanger works in an interesting way at 3 m depth, resulting a remarkable cooling/heating load. The cooling and heating of the EAHE in both winter and summer seasons via a theoretical calculation was analyzed [12]. The different studies in several impacts of an earth-air heat exchanger in semi-arid and arid regions were reviewed [13].…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of EAHE System in Algerian Site: Case Study of Ghardaïa

Benbelgacem¹,

Kaddour²,

Bezari³

et al. 2022

IJDNE

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Among the renewable energies there is geothermal energy, conventional air conditioning has negative consequences on the environment, to have an economical and sustainable solution: the EAHE respond to this concern. In the current study, the study of the thermal performance of the earth-air heat exchanger (EAHE) has been completed. For the impact of transient heat transfer in the ground near the hose, the thermal saturation of the ground is well mentioned. In addition, the role of the burial depth of the EAHE system is also taken into account during this work. The suitable depth of the buried tubes was determined by implementing the thermo-physical properties of the soil of the studied site located in Ghardaïa (Algeria) by writing a specific program. A parametric investigation was accomplished the effects of the length and the diameter of the pipe, in addition the speed of the inlet air on the temperature of the outlet of the EAHE system in both cases PVC and HDPE material. The results showed that the optimal parameters in order to obtain a good performance for the studied EAHE: maximal value of pipe length, and minimal values of diameter pipe and air velocity 30 mm and 1.2 m/s respectively.

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“…Other tools, as Ansys Fluent [20][21][22], Ansys CFX [23], Comsol Multiphysics [24], Matlab [25][26][27] or Scilab [28] were also used. However, although they offer great possibilities, their use requires specialised knowledge and experience.…”

Section: Introductionmentioning

confidence: 99%

Impact of Air Density Variation on a Simulated Earth-to-Air Heat Exchanger’s Performance

Michalak

2022

Energies

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Due to their simple design and reliable operation, earth-to-air heat exchangers (EAHE) are used in modern buildings to reduce ventilation heat losses. EAHE operation in atmospheric conditions results in variation in ambient air temperature and pressure affecting air density. The paper presents the study on the impact of ambient air density variation on the calculated hourly air temperature at the EAHE outlet and the resulting energy use for space heating and cooling of an exemplary residential building. The ground temperature was computed from the model given in EN 16798-5-1. Then, air density was obtained using five various methods. Energy use for space heating and cooling of the building was computed using the 5R1C thermal network model of EN ISO 13790. Depending on the chosen method and concerning the base case without EAHE, a reduction in annual heating and cooling needs was obtained from 7.5% to 8.8% in heating and from 15.3% to 19% in cooling. Annual heating and cooling gain from EAHE were 600.9 kWh and 628.3 kWh for heating and 616.9 kWh and 603.5 kWh forcooling for the Typical Meteorological Years (TMY) and International Weather for Energy Calculation (IWEC) files, respectively. Unit heating and cooling gains per heat exchanger area were from 34.9 kWh/m2 to 36.8 kWh/m2 and from −35.1 kWh/m2 to −36.3 kWh/m2. Density variation with temperature from the relevant typical Polish meteorological year at constant pressure, in comparison to the method of EN 16798-5-1, resulted in an hourly difference of that unit gain up to 4.3 W/m2 and 2.0 W/m2 for heating and cooling, respectively. The same was true inthe case of IWEC files that resulted in differences of 5.5 W/m2 and 1.1 W/m2.

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Feasibility analysis of Earth-Air Heat Exchanger (EAHE) in a sports and culture center in Tianjin, China

Cited by 11 publications

References 14 publications

A numerical study on heating performance of horizontal and vertical earth-air heat exchangers with equal pipe lengths

A numerical study on heating performance of horizontal and vertical earth-air heat exchangers with equal pipe lengths

Thermal Performance of EAHE System in Algerian Site: Case Study of Ghardaïa

Impact of Air Density Variation on a Simulated Earth-to-Air Heat Exchanger’s Performance

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